What a find! I'm so excited about this World War II era stationery, just listed in my etsy shop. The little envelope with wings is my favorite part!
This is a complete original set of Wessel's Air Mail Envo-Letters, in original packaging. The paper folder contains 12 sheets of aerogramme-style stationery, which fold up into their own envelopes. The 1940s air mail graphics are stunning! Though they do not have a specific date on them, I'm near certain they are from the 1940s, roughly in the World War 2 era.
The packaging folders do show some wear and age spots, as you can see in the photos, but the envo-letters contained inside are in excellent shape, perfect for modern retro letter writing (or for the collector, of course). Above you see the folded sheets on the outside, with the excellent red and blue air mail stripes...
...and they are mostly blank on the inside, except for the fantastic Air Mail with wings graphic shown in close-up at the top of this post.
For aficionados of vintage writing instruments, I have enjoyed these in my own letter-writing, and can attest that this vintage paper is very fountain pen friendly, and takes fountain pen ink beautifully.
These are not to be confused with V-Mails, which Wessel also manufactured - V-Mails were for correspondence with American troops stationed overseas, but these Envo-Letters looked to be for any international air mail. (I also sell vintage WWII V-Mail sets, too.)
I have a few of these sets in the original packaging - fun to look at, and fun to write on. Check out an example of one I sent internationally a few months ago.